includes/Wiki.php

   1 <?php
   2 /**
   3  * MediaWiki is the to-be base class for this whole project
   4  *
   5  * @internal documentation reviewed 15 Mar 2010
   6  */
   7 class MediaWiki {
   8         var $params = array();
   9
  10         /** Constructor */
  11         function __construct() {}
  12
  13         /**
  14          * Stores key/value pairs to circumvent global variables
  15          * Note that keys are case-insensitive!
  16          *
  17          * @param $key String: key to store
  18          * @param $value Mixed: value to put for the key
  19          */
  20         function setVal( $key, &$value ) {
  21                 $key = strtolower( $key );
  22                 $this->params[$key] =& $value;
  23         }
  24
  25         /**
  26          * Retrieves key/value pairs to circumvent global variables
  27          * Note that keys are case-insensitive!
  28          *
  29          * @param $key String: key to get
  30          * @param $default string default value, defaults to empty string
  31          * @return $default Mixed: default value if if the key doesn't exist
  32          */
  33         function getVal( $key, $default = '' ) {
  34                 $key = strtolower( $key );
  35                 if( isset( $this->params[$key] ) ) {
  36                         return $this->params[$key];
  37                 }
  38                 return $default;
  39         }
  40
  41         /**
  42          * Initialization of ... everything
  43          * Performs the request too
  44          *
  45          * @param $title Title ($wgTitle)
  46          * @param $article Article
  47          * @param $output OutputPage
  48          * @param $user User
  49          * @param $request WebRequest
  50          */
  51         function performRequestForTitle( &$title, &$article, &$output, &$user, $request ) {
  52                 wfProfileIn( __METHOD__ );
  53
  54                 $output->setTitle( $title );
  55
  56                 wfRunHooks( 'BeforeInitialize', array( &$title, &$article, &$output, &$user, $request, $this ) );
  57
  58                 if( !$this->preliminaryChecks( $title, $output ) ) {
  59                         wfProfileOut( __METHOD__ );
  60                         return;
  61                 }
  62                 // Call handleSpecialCases() to deal with all special requests...
  63                 if( !$this->handleSpecialCases( $title, $output, $request ) ) {
  64                         // ...otherwise treat it as an article view. The article
  65                         // may be a redirect to another article or URL.
  66                         $new_article = $this->initializeArticle( $title, $output, $request );
  67                         if( is_object( $new_article ) ) {
  68                                 $article = $new_article;
  69                                 $this->performAction( $output, $article, $title, $user, $request );
  70                         } elseif( is_string( $new_article ) ) {
  71                                 $output->redirect( $new_article );
  72                         } else {
  73                                 wfProfileOut( __METHOD__ );
  74                                 throw new MWException( "Shouldn't happen: MediaWiki::initializeArticle() returned neither an object nor a URL" );
  75                         }
  76                 }
  77                 wfProfileOut( __METHOD__ );
  78         }
  79
  80         /**
  81          * Check if the maximum lag of database slaves is higher that $maxLag, and
  82          * if it's the case, output an error message
  83          *
  84          * @param $maxLag int: maximum lag allowed for the request, as supplied by
  85          *                the client
  86          * @return bool true if the request can continue
  87          */
  88         function checkMaxLag( $maxLag ) {
  89                 list( $host, $lag ) = wfGetLB()->getMaxLag();
  90                 if( $lag > $maxLag ) {
  91                         wfMaxlagError( $host, $lag, $maxLag );
  92                         return false;
  93                 } else {
  94                         return true;
  95                 }
  96         }
  97
  98         /**
  99          * Checks some initial queries
 100          * Note that $title here is *not* a Title object, but a string!
 101          *
 102          * @param $title String
 103          * @param $action String
 104          * @return Title object to be $wgTitle
 105          */
 106         function checkInitialQueries( $title, $action ) {
 107                 global $wgOut, $wgRequest, $wgContLang;
 108                 if( $wgRequest->getVal( 'printable' ) === 'yes' ) {
 109                         $wgOut->setPrintable();
 110                 }
 111
 112                 $curid = $wgRequest->getInt( 'curid' );
 113                 if( $wgRequest->getCheck( 'search' ) ) {
 114                         // Compatibility with old search URLs which didn't use Special:Search
 115                         // Just check for presence here, so blank requests still
 116                         // show the search page when using ugly URLs (bug 8054).
 117                         $ret = SpecialPage::getTitleFor( 'Search' );
 118                 } elseif( $curid ) {
 119                         // URLs like this are generated by RC, because rc_title isn't always accurate
 120                         $ret = Title::newFromID( $curid );
 121                 } elseif( $title == '' && $action != 'delete' ) {
 122                         $ret = Title::newMainPage();
 123                 } else {
 124                         $ret = Title::newFromURL( $title );
 125                         // check variant links so that interwiki links don't have to worry
 126                         // about the possible different language variants
 127                         if( count( $wgContLang->getVariants() ) > 1 && !is_null( $ret ) && $ret->getArticleID() == 0 )
 128                                 $wgContLang->findVariantLink( $title, $ret );
 129                 }
 130                 // For non-special titles, check for implicit titles
 131                 if( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) {
 132                         // We can have urls with just ?diff=,?oldid= or even just ?diff=
 133                         $oldid = $wgRequest->getInt( 'oldid' );
 134                         $oldid = $oldid ? $oldid : $wgRequest->getInt( 'diff' );
 135                         // Allow oldid to override a changed or missing title
 136                         if( $oldid ) {
 137                                 $rev = Revision::newFromId( $oldid );
 138                                 $ret = $rev ? $rev->getTitle() : $ret;
 139                         }
 140                 }
 141                 return $ret;
 142         }
 143
 144         /**
 145          * Checks for anon-cannot-read case
 146          *
 147          * @param $title Title
 148          * @param $output OutputPage
 149          * @return boolean true if successful
 150          */
 151         function preliminaryChecks( &$title, &$output ) {
 152                 // If the user is not logged in, the Namespace:title of the article must be in
 153                 // the Read array in order for the user to see it. (We have to check here to
 154                 // catch special pages etc. We check again in Article::view())
 155                 if( !is_null( $title ) && !$title->userCanRead() ) {
 156                         global $wgDeferredUpdateList;
 157                         $output->loginToUse();
 158                         $this->finalCleanup( $wgDeferredUpdateList, $output );
 159                         $output->disable();
 160                         return false;
 161                 }
 162                 return true;
 163         }
 164
 165         /**
 166          * Initialize some special cases:
 167          * - bad titles
 168          * - local interwiki redirects
 169          * - redirect loop
 170          * - special pages
 171          *
 172          * @param $title Title
 173          * @param $output OutputPage
 174          * @param $request WebRequest
 175          * @return bool true if the request is already executed
 176          */
 177         function handleSpecialCases( &$title, &$output, $request ) {
 178                 wfProfileIn( __METHOD__ );
 179
 180                 $action = $this->getVal( 'Action' );
 181
 182                 // Invalid titles. Bug 21776: The interwikis must redirect even if the page name is empty.
 183                 if( is_null($title) || ( ( $title->getDBkey() == '' ) && ( $title->getInterwiki() == '' ) ) ) {
 184                         $title = SpecialPage::getTitleFor( 'Badtitle' );
 185                         $output->setTitle( $title ); // bug 21456
 186                         // Die now before we mess up $wgArticle and the skin stops working
 187                         throw new ErrorPageError( 'badtitle', 'badtitletext' );
 188
 189                 // Interwiki redirects
 190                 } else if( $title->getInterwiki() != '' ) {
 191                         $rdfrom = $request->getVal( 'rdfrom' );
 192                         if( $rdfrom ) {
 193                                 $url = $title->getFullURL( 'rdfrom=' . urlencode( $rdfrom ) );
 194                         } else {
 195                                 $query = $request->getValues();
 196                                 unset( $query['title'] );
 197                                 $url = $title->getFullURL( $query );
 198                         }
 199                         /* Check for a redirect loop */
 200                         if( !preg_match( '/^' . preg_quote( $this->getVal('Server'), '/' ) . '/', $url ) && $title->isLocal() ) {
 201                                 $output->redirect( $url );
 202                         } else {
 203                                 $title = SpecialPage::getTitleFor( 'Badtitle' );
 204                                 $output->setTitle( $title ); // bug 21456
 205                                 wfProfileOut( __METHOD__ );
 206                                 throw new ErrorPageError( 'badtitle', 'badtitletext' );
 207                         }
 208                 // Redirect loops, no title in URL, $wgUsePathInfo URLs, and URLs with a variant
 209                 } else if ( $action == 'view' && !$request->wasPosted()
 210                         && ( $request->getVal( 'title' ) === null || $title->getPrefixedDBKey() != $request->getText( 'title' ) )
 211                         && !count( array_diff( array_keys( $request->getValues() ), array( 'action', 'title' ) ) ) )
 212                 {
 213                         if ( $title->getNamespace() == NS_SPECIAL ) {
 214                                 list( $name, $subpage ) = SpecialPage::resolveAliasWithSubpage( $title->getDBkey() );
 215                                 if ( $name ) {
 216                                         $title = SpecialPage::getTitleFor( $name, $subpage );
 217                                 }
 218                         }
 219                         $targetUrl = $title->getFullURL();
 220                         // Redirect to canonical url, make it a 301 to allow caching
 221                         if( $targetUrl == $request->getFullRequestURL() ) {
 222                                 $message = "Redirect loop detected!\n\n" .
 223                                         "This means the wiki got confused about what page was " .
 224                                         "requested; this sometimes happens when moving a wiki " .
 225                                         "to a new server or changing the server configuration.\n\n";
 226
 227                                 if( $this->getVal( 'UsePathInfo' ) ) {
 228                                         $message .= "The wiki is trying to interpret the page " .
 229                                                 "title from the URL path portion (PATH_INFO), which " .
 230                                                 "sometimes fails depending on the web server. Try " .
 231                                                 "setting \"\$wgUsePathInfo = false;\" in your " .
 232                                                 "LocalSettings.php, or check that \$wgArticlePath " .
 233                                                 "is correct.";
 234                                 } else {
 235                                         $message .= "Your web server was detected as possibly not " .
 236                                                 "supporting URL path components (PATH_INFO) correctly; " .
 237                                                 "check your LocalSettings.php for a customized " .
 238                                                 "\$wgArticlePath setting and/or toggle \$wgUsePathInfo " .
 239                                                 "to true.";
 240                                 }
 241                                 wfHttpError( 500, "Internal error", $message );
 242                                 wfProfileOut( __METHOD__ );
 243                                 return false;
 244                         } else {
 245                                 $output->setSquidMaxage( 1200 );
 246                                 $output->redirect( $targetUrl, '301' );
 247                         }
 248                 // Special pages
 249                 } else if( NS_SPECIAL == $title->getNamespace() ) {
 250                         /* actions that need to be made when we have a special pages */
 251                         SpecialPage::executePath( $title );
 252                 } else {
 253                         /* No match to special cases */
 254                         wfProfileOut( __METHOD__ );
 255                         return false;
 256                 }
 257                 /* Did match a special case */
 258                 wfProfileOut( __METHOD__ );
 259                 return true;
 260         }
 261
 262         /**
 263          * Create an Article object of the appropriate class for the given page.
 264          *
 265          * @param $title Title
 266          * @return Article object
 267          */
 268         static function articleFromTitle( &$title ) {
 269                 if( NS_MEDIA == $title->getNamespace() ) {
 270                         // FIXME: where should this go?
 271                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 272                 }
 273
 274                 $article = null;
 275                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$article ) );
 276                 if( $article ) {
 277                         return $article;
 278                 }
 279
 280                 switch( $title->getNamespace() ) {
 281                         case NS_FILE:
 282                                 return new ImagePage( $title );
 283                         case NS_CATEGORY:
 284                                 return new CategoryPage( $title );
 285                         default:
 286                                 return new Article( $title );
 287                 }
 288         }
 289
 290         /**
 291          * Initialize the object to be known as $wgArticle for "standard" actions
 292          * Create an Article object for the page, following redirects if needed.
 293          *
 294          * @param $title Title ($wgTitle)
 295          * @param $output OutputPage ($wgOut)
 296          * @param $request WebRequest ($wgRequest)
 297          * @return mixed an Article, or a string to redirect to another URL
 298          */
 299         function initializeArticle( &$title, &$output, $request ) {
 300                 wfProfileIn( __METHOD__ );
 301
 302                 $action = $this->getVal( 'action', 'view' );
 303                 $article = self::articleFromTitle( $title );
 304                 // NS_MEDIAWIKI has no redirects.
 305                 // It is also used for CSS/JS, so performance matters here...
 306                 if( $title->getNamespace() == NS_MEDIAWIKI ) {
 307                         wfProfileOut( __METHOD__ );
 308                         return $article;
 309                 }
 310                 // Namespace might change when using redirects
 311                 // Check for redirects ...
 312                 $file = ($title->getNamespace() == NS_FILE) ? $article->getFile() : null;
 313                 if( ( $action == 'view' || $action == 'render' )        // ... for actions that show content
 314                         && !$request->getVal( 'oldid' ) &&    // ... and are not old revisions
 315                         !$request->getVal( 'diff' ) &&    // ... and not when showing diff
 316                         $request->getVal( 'redirect' ) != 'no' &&       // ... unless explicitly told not to
 317                         // ... and the article is not a non-redirect image page with associated file
 318                         !( is_object( $file ) && $file->exists() && !$file->getRedirected() ) )
 319                 {
 320                         // Give extensions a change to ignore/handle redirects as needed
 321                         $ignoreRedirect = $target = false;
 322
 323                         $dbr = wfGetDB( DB_SLAVE );
 324                         $article->loadPageData( $article->pageDataFromTitle( $dbr, $title ) );
 325
 326                         wfRunHooks( 'InitializeArticleMaybeRedirect',
 327                                 array(&$title,&$request,&$ignoreRedirect,&$target,&$article) );
 328
 329                         // Follow redirects only for... redirects.
 330                         // If $target is set, then a hook wanted to redirect.
 331                         if( !$ignoreRedirect && ($target || $article->isRedirect()) ) {
 332                                 // Is the target already set by an extension?
 333                                 $target = $target ? $target : $article->followRedirect();
 334                                 if( is_string( $target ) ) {
 335                                         if( !$this->getVal( 'DisableHardRedirects' ) ) {
 336                                                 // we'll need to redirect
 337                                                 wfProfileOut( __METHOD__ );
 338                                                 return $target;
 339                                         }
 340                                 }
 341                                 if( is_object($target) ) {
 342                                         // Rewrite environment to redirected article
 343                                         $rarticle = self::articleFromTitle( $target );
 344                                         $rarticle->loadPageData( $rarticle->pageDataFromTitle( $dbr, $target ) );
 345                                         if( $rarticle->exists() || ( is_object( $file ) && !$file->isLocal() ) ) {
 346                                                 $rarticle->setRedirectedFrom( $title );
 347                                                 $article = $rarticle;
 348                                                 $title = $target;
 349                                                 $output->setTitle( $title );
 350                                         }
 351                                 }
 352                         } else {
 353                                 $title = $article->getTitle();
 354                         }
 355                 }
 356                 wfProfileOut( __METHOD__ );
 357                 return $article;
 358         }
 359
 360         /**
 361          * Cleaning up request by doing:
 362          ** deferred updates, DB transaction, and the output
 363          *
 364          * @param $deferredUpdates array of updates to do
 365          * @param $output OutputPage
 366          */
 367         function finalCleanup( &$deferredUpdates, &$output ) {
 368                 wfProfileIn( __METHOD__ );
 369                 // Now commit any transactions, so that unreported errors after
 370                 // output() don't roll back the whole DB transaction
 371                 $factory = wfGetLBFactory();
 372                 $factory->commitMasterChanges();
 373                 // Output everything!
 374                 $output->output();
 375                 // Do any deferred jobs
 376                 $this->doUpdates( $deferredUpdates );
 377                 // Close the session so that jobs don't access the current session
 378                 session_write_close();
 379                 $this->doJobs();
 380                 wfProfileOut( __METHOD__ );
 381         }
 382
 383         /**
 384          * Deferred updates aren't really deferred anymore. It's important to report
 385          * errors to the user, and that means doing this before OutputPage::output().
 386          * Note that for page saves, the client will wait until the script exits
 387          * anyway before following the redirect.
 388          *
 389          * @param $updates array of objects that hold an update to do
 390          */
 391         function doUpdates( &$updates ) {
 392                 wfProfileIn( __METHOD__ );
 393                 /* No need to get master connections in case of empty updates array */
 394                 if (!$updates) {
 395                         wfProfileOut( __METHOD__ );
 396                         return;
 397                 }
 398
 399                 $dbw = wfGetDB( DB_MASTER );
 400                 foreach( $updates as $up ) {
 401                         $up->doUpdate();
 402
 403                         // Commit after every update to prevent lock contention
 404                         if( $dbw->trxLevel() ) {
 405                                 $dbw->commit();
 406                         }
 407                 }
 408                 wfProfileOut( __METHOD__ );
 409         }
 410
 411         /**
 412          * Do a job from the job queue
 413          */
 414         function doJobs() {
 415                 $jobRunRate = $this->getVal( 'JobRunRate' );
 416
 417                 if( $jobRunRate <= 0 || wfReadOnly() ) {
 418                         return;
 419                 }
 420                 if( $jobRunRate < 1 ) {
 421                         $max = mt_getrandmax();
 422                         if( mt_rand( 0, $max ) > $max * $jobRunRate ) {
 423                                 return;
 424                         }
 425                         $n = 1;
 426                 } else {
 427                         $n = intval( $jobRunRate );
 428                 }
 429
 430                 while ( $n-- && false != ( $job = Job::pop() ) ) {
 431                         $output = $job->toString() . "\n";
 432                         $t = -wfTime();
 433                         $success = $job->run();
 434                         $t += wfTime();
 435                         $t = round( $t*1000 );
 436                         if( !$success ) {
 437                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 438                         } else {
 439                                 $output .= "Success, Time: $t ms\n";
 440                         }
 441                         wfDebugLog( 'jobqueue', $output );
 442                 }
 443         }
 444
 445         /**
 446          * Ends this task peacefully
 447          */
 448         function restInPeace() {
 449                 MessageCache::logMessages();
 450                 wfLogProfilingData();
 451                 // Commit and close up!
 452                 $factory = wfGetLBFactory();
 453                 $factory->commitMasterChanges();
 454                 $factory->shutdown();
 455                 wfDebug( "Request ended normally\n" );
 456         }
 457
 458         /**
 459          * Perform one of the "standard" actions
 460          *
 461          * @param $output OutputPage
 462          * @param $article Article
 463          * @param $title Title
 464          * @param $user User
 465          * @param $request WebRequest
 466          */
 467         function performAction( &$output, &$article, &$title, &$user, &$request ) {
 468                 wfProfileIn( __METHOD__ );
 469
 470                 if( !wfRunHooks( 'MediaWikiPerformAction', array( $output, $article, $title, $user, $request, $this ) ) ) {
 471                         wfProfileOut( __METHOD__ );
 472                         return;
 473                 }
 474
 475                 $action = $this->getVal( 'Action' );
 476                 if( in_array( $action, $this->getVal( 'DisabledActions', array() ) ) ) {
 477                         /* No such action; this will switch to the default case */
 478                         $action = 'nosuchaction';
 479                 }
 480
 481                 // Workaround for bug #20966: inability of IE to provide an action dependent
 482                 // on which submit button is clicked.
 483                 if ( $action === 'historysubmit' ) {
 484                         if ( $request->getBool( 'revisiondelete' ) ) {
 485                                 $action = 'revisiondelete';
 486                         } elseif ( $request->getBool( 'revisionmove' ) ) {
 487                                 $action = 'revisionmove';
 488                         } else {
 489                                 $action = 'view';
 490                         }
 491                 }
 492
 493                 switch( $action ) {
 494                         case 'view':
 495                                 $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 496                                 $article->view();
 497                                 break;
 498                         case 'raw': // includes JS/CSS
 499                                 wfProfileIn( __METHOD__.'-raw' );
 500                                 $raw = new RawPage( $article );
 501                                 $raw->view();
 502                                 wfProfileOut( __METHOD__.'-raw' );
 503                                 break;
 504                         case 'watch':
 505                         case 'unwatch':
 506                         case 'delete':
 507                         case 'revert':
 508                         case 'rollback':
 509                         case 'protect':
 510                         case 'unprotect':
 511                         case 'info':
 512                         case 'markpatrolled':
 513                         case 'render':
 514                         case 'deletetrackback':
 515                         case 'purge':
 516                                 $article->$action();
 517                                 break;
 518                         case 'print':
 519                                 $article->view();
 520                                 break;
 521                         case 'dublincore':
 522                                 if( !$this->getVal( 'EnableDublinCoreRdf' ) ) {
 523                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nodublincore' ) );
 524                                 } else {
 525                                         $rdf = new DublinCoreRdf( $article );
 526                                         $rdf->show();
 527                                 }
 528                                 break;
 529                         case 'creativecommons':
 530                                 if( !$this->getVal( 'EnableCreativeCommonsRdf' ) ) {
 531                                         wfHttpError( 403, 'Forbidden', wfMsg( 'nocreativecommons' ) );
 532                                 } else {
 533                                         $rdf = new CreativeCommonsRdf( $article );
 534                                         $rdf->show();
 535                                 }
 536                                 break;
 537                         case 'credits':
 538                                 Credits::showPage( $article );
 539                                 break;
 540                         case 'submit':
 541                                 if( session_id() == '' ) {
 542                                         /* Send a cookie so anons get talk message notifications */
 543                                         wfSetupSession();
 544                                 }
 545                                 /* Continue... */
 546                         case 'edit':
 547                         case 'editredlink':
 548                                 if( wfRunHooks( 'CustomEditor', array( $article, $user ) ) ) {
 549                                         $internal = $request->getVal( 'internaledit' );
 550                                         $external = $request->getVal( 'externaledit' );
 551                                         $section = $request->getVal( 'section' );
 552                                         $oldid = $request->getVal( 'oldid' );
 553                                         if( !$this->getVal( 'UseExternalEditor' ) || $action=='submit' || $internal ||
 554                                            $section || $oldid || ( !$user->getOption( 'externaleditor' ) && !$external ) ) {
 555                                                 $editor = new EditPage( $article );
 556                                                 $editor->submit();
 557                                         } elseif( $this->getVal( 'UseExternalEditor' ) && ( $external || $user->getOption( 'externaleditor' ) ) ) {
 558                                                 $mode = $request->getVal( 'mode' );
 559                                                 $extedit = new ExternalEdit( $article, $mode );
 560                                                 $extedit->edit();
 561                                         }
 562                                 }
 563                                 break;
 564                         case 'history':
 565                                 if( $request->getFullRequestURL() == $title->getInternalURL( 'action=history' ) ) {
 566                                         $output->setSquidMaxage( $this->getVal( 'SquidMaxage' ) );
 567                                 }
 568                                 $history = new HistoryPage( $article );
 569                                 $history->history();
 570                                 break;
 571                         case 'revisiondelete':
 572                                 // For show/hide submission from history page
 573                                 $special = SpecialPage::getPage( 'Revisiondelete' );
 574                                 $special->execute( '' );
 575                                 break;
 576                         case 'revisionmove':
 577                                 // For revision move submission from history page
 578                                 $special = SpecialPage::getPage( 'RevisionMove' );
 579                                 $special->execute( '' );
 580                                 break;
 581                         default:
 582                                 if( wfRunHooks( 'UnknownAction', array( $action, $article ) ) ) {
 583                                         $output->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
 584                                 }
 585                 }
 586                 wfProfileOut( __METHOD__ );
 587
 588         }
 589
 590 }